Admin: Remove unused messages and topicicons views (code cleanup)

Unfinished features should be kept in their own branches.
Admin: Change models to use more Joomla standards
Merge remote branch 'upstream/master'
Small post merge fix
Merge pull request #1399 from xillibit/k30_bugs3

#1338 K3.0: cannot change page in emoticon manager
#1333 K3.0: PHP Strict standards: Declaration of KunenaControllerInstall
Merge pull request #1400 from xillibit/k30_bugs5

#1333 K3.0: PHP Strict standards: Declaration of KunenaControllerInstall
Merge remote branch 'upstream/master'
Merge pull request #1404 from mahagr/master

Admin: Remove unused messages and topicicons views (code cleanup), model work
#1405 Backend File Manager: Sort columns gives SQL error, Fixes #1405